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STMicroelectronics Electronic Components Datasheet

L6287 Datasheet

POWER COMBO DRIVER

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L6287 pdf
L6287
POWER COMBO DRIVER
DESCRIPTION
The F-VHS Motor Driver COMBO IC includes a
double three phase brushless motor driver plus a
DC full bridge motor driver for VCR application.
The package is SDIP42 (38+2+2 pin ground
frame).
The device is realized in BCD technology with
power LDMOS output stages.
The gate drive for high side stages is provided by
an internal charge pump with two external capaci-
tors. The first three phase motor driver is devoted
to the DRUM motor control.
The phase sequence update signal is provided in-
itially by an external start-up signal (FSTART),
whose frequency is internally divided by four,
while, during normal operation, is provided by an
optical tacho converter signal.
This signal is used as clock and reset for the state
machine.
The regulation of the speed is externally provided
by means of PWM signal generated by the µP
(DPWM), without external sensing resistor. The
feedback to the µP unit is given by a suitable
open drain output signal (PUD) synchronized by
the internal state machine.
The second three phase motor driver is devoted
to the CAPSTAN control. While the DRUM will al-
ways spin in a fixed direction, the CAPSTAN mo-
tor needs a more sophisticated logic to control the
changes in spin direction.
The motor position detection is carried out by
means of three comparators for Hall effect sen-
sors. The loop regulation for this motor is still pro-
vided by the µP with the signals CPWM and
CDIR.
The LOADING motor section include a full bridge
DC motor driver. The motor operations are di-
rectly set by the inputs LPWM, LDIR according to
the truth table reported on the page 5.
The device also includes a circuit for early ther-
mal alarm, last thermal alarm and thermal shut-
down with hysteresys. The output of this stage is
an open drain, kept ON during normal operations.
The THERM signal follows the inverted FSTART
signal between early warning and last warning
temperature, while remains in high impedance
(OFF) after lastwarning temperature and during
thermal shutdown.
SDIP42
ORDERING NUMBER: L6287
The STANDBY state of the device is imposed by
THERMAL SHUTDOWN
UNDERVOLTAGE ON VCC SUPPLY
EXTERNAL SIGNAL FSTART;
This state is imposed automatically after a de-
fined time-out.
The time-out is realized by sensing the falling
edges of the FSTART signal: if no edges are re-
corded for a time interval greater than a certain
time constant, the STANDBY condition is gener-
ated.
The time constant is defined by the external ca-
pacitor CTO.
In the STANDBY state the main functions (upper
power stages, opto decoder, etc) of the device
are turned off in order to minimize the power con-
sumption.
The device also implement a HEATER function.
The HEATER transistor is OFF during thermal
shutdown, undervoltage condition and during nor-
mal working mode.
The HEATER transistor is driven ON when the
external STANDBY condition is present according
to the following table:
FSTART
HIGH
LOW
HEATER
OFF
ON
During the ON condition, the specified heater Ron
is not guaranteed if all the voltage supplies are
not at their minimum nominal value.
February 1997
1/9
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.


STMicroelectronics Electronic Components Datasheet

L6287 Datasheet

POWER COMBO DRIVER

No Preview Available !

L6287 pdf
L6287
ABSOLUTE MAXIMUM RATINGS
Symbol
VDD
VDC
VDL
UPPER POWER
VDS MAX
LOWERPOWER
VDS MAX
VCC
VS
Ip 1
Ip d
Ipc
Vil
Vih
Vtherm
Vheat
Parameter
Drum Supply Voltage
Capstan Supply Voltage
Loading Supply Voltage
Motor Output to Ground Voltage
Motor Output to Supply Voltage
Logic Supply Voltage
Special Supply Voltage
Loading Motor Peak Current (Ton = 1µs Duty Cycle = 2%)
Drum Motor Peak Current (Ton = 1µs Duty Cycle = 2%)
Capstan Motor Peak Current (Ton = 1µs Duty Cycle = 2%)
Logic Input Low State Voltage
Logic Input High StateVoltage
Open Drain Maximum Voltage
Open Drain Maximum Voltage
(**) Not operative - STANDBY condition
(***) Each motor driver
PINS CONNECTION
Value
20
20
20
20
20
7
7
1.6
1.4
1.8
-0.1
7
7
20
Unit
V (**)
V (**)
V (**)
V(***)
V (***)
V
V
A
A
A
V
V
V
V (**)
THERMAL DATA
Symbol
Rth j-amb
R th j-pins
Parameter
Thermal Resistance Junction to Ambient
Thermal Resistance Junction to Pin
Note: Batwing pin.
2/9
Value
48
15
Unit
°C/W
°C/W


Part Number L6287
Description POWER COMBO DRIVER
Maker STMicroelectronics
Total Page 9 Pages
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